While Intel offers 4-cores mobile processors up to 2.53Ghz for a year, based on core2 technology, Apple doesn’t make the move, probably due to power consumption of these chips, that will impair autonomy and pose problems for heat dissipation on the slim MacBook Pro.
Intel’s just announced a new linup of 4-core processors, based on a technology derived from the one used in the new MacPro, that proved to be impressively fast even at lower clock speed. But the real novelty is that the consumption is really low, with less than 35W at 2.0Ghz.
The MacBook Pro line up will benefit from these Clarksfield processors at 1.73Ghz, 2.0Ghz and a 2.26Ghz (option), with 4 physical cores and 8 logical threads, with a clear benefit for Pro users that use multithreaded softwares, the new MacBook Pro will offer up to 2X the speed of the actual models!!!
Even if Apple may deliver early, seems the new MacBook Pro will be there during may or early june.
Technical Footnote:
The Clarksfield processors integrate the fastest DDR3 controller, offering the ability to offers 12GB RAM configuration on laptops with 3 DDR3-4GB DIMM, that’s a big plus.
It -also- integrates a graphic controller, but it seems that Apple decides to use only the GeForce 9600M, the Intel chip being insufficient to drive correctly internal and external screens for professional use.
MacBook Pro
4-core, Clarksfield
Yes, finally, the Mac Mini is a serious computer for developpers, or evryone that need to display many things at once: both video ports are enabled, mini DisplayPort (the proprietary Apple port that isn’t technically compatible with real DisplayPort) and the mini DVI (that is a full DVI).
You could choose to hookup two screens of any resolution up to 1920×1200 (up to 27″), using them as mirroring or extended desktop mode.
Thanks Apple 
Mac Mini
dual screen
Apple use misleading name for their iMac GPU, such as talking about Radeon 2600 Pro for underclocked Radeon 2600 XT, leading to some judgement errors, often trying to hide slower and cheaper GPU than actually integrated
The old generation iMac has a “Geforce 8800 GS” option, a 8800 GS has 96 processors at 550/1375Mhz, and 384MB ram at 800Mhz with a 192bits interface (nvidia spec for the Geforce 8800GS), and in fact it is a “GeForce 8800M GTS”, that sport 64processors at 500/1250Mhz, up to 512MB RAM at 800Mhz with 256bits interface (nVidia’s official specs). Something that is 30% to 40% slower!!!
The new iMac has officially a “GT130″, with 48 processor cores at 500/1250Mhz, and up to 768MB RAM at 500Mhz with 192bits interface. (Official nVidia Specs here). Notice that memory bandwith is in the level of a GeForce 8600 GT!
In fact the new iMac end-up with a “GeForce 9800M GS”, with 64 processor cores, 256bits memory interface and is given twice the memory speed of the GT130, so it’s probably around 800Mhz. (nVidia official page) Good news finally!
So, the new iMac may be not so bad with it’s 9800M GS, that is equivalent to a desktop Geforce 9600, and probably on the same range of performance as the old iMac.
General, Hardware, iMac
GeForce 8800GS, GeForce 8800M GTS, Geforce 9800M GS, gpu, GT130, iMac
The MacPro has been renewed and now support the Nehalem Xeon processor, but instead of offering more at the same tag price, Apple decided to offer less at the same tag price!!!
The entry-level is now $2899 in Canada with 2.66Ghz x 4-core (8 threads), instead of $2799 for 2.8Ghz x 8-core that is faster in any condition, and the new 8-core begins at $3299 ($500 higher) while being slower than the old 8-core (priced at $2799!), this is just more expansive, and if you want to have better performance than older 8-core 2.8Ghz system, you have to go to 2.66Ghz 8-core priced at $4699, a $1900 premium!!!
Next is the graphic card, a GeForce GT120, that is just the old GeForce 8600GT in disguise, a card that is expected in $500 media center, but not on a $3000+ computer!
Where’s CUDA and OpenCL with such under-powered GPU???
Desktop, Hardware, Mac Pro
Apple decided to downgrade the GPU of the iMac from Radeon 2400/2600 to an integrated chipset GPU that is slower, don’t upgrade the CPU to quad-core (such as any challenging computer), but added a little RAM and bigger hard-drive.
It disappoint me, because Apple upgraded the CPU power of the MacPro (Nehalem), and talk about GPU power using CUDA or OpenCL that will be natively supported in Snow Leopard.
The new iMac offer low GPU power in low-end, and approximately the same average performance level as the last generation while costing more, in high-end! And PC offers from 2X to 6X GPU performance-level at these prices!
The CPU itself is no faster than laptop CPU, than Apple’s laptop CPU, because even high-end laptop offers quad-core these days! The new iMac is underpowered 
Desktop, Hardware, iMac