MBP chip speculation
This CPU cannot be an i5 unless intel are making a specific CPU for the MBP. The only mobile dual-core Sandy Bridge CPU at 2.3 GHz is the i7-2649M at 25W (check mobile processors at ark.intel.com if you don't believe me). It would make sense that this MBP is a slightly higher spec as the only other non-embedded mobile CPU at 25W is i7-2629M at 2.1 GHz. Apple have never in the past used different CPU & GPU power rated MBP's in the past, so this is the logical conclusion.
From deduction, the newer MBA released this year will most likely us the 17W Sandy Bridge processors, which would be a 13W reduction in TDP over the current 11" and 20W reduction over the current 13". This is assuming the integrated 320M has a TDP of 20W, (only reference wiki
http://en.wikipedia.org/wiki/Comparison_of_Nvidia_graphics_processing_units).This is measuring the CPU + iGP as 10 + 20 for the 11" and 17 + 20 for the 13". In short, this will mean a lot less heat output of the MBA as well as massive battery life.
For the 13" MBP, these will have no discrete GPU so the power would be 25W compared to the current 45W for CPU + iGP, which will basically mean massive battery life.
For the 15" MBP, they will almost definitely use the 35W chips i5-2520M, i5-2540M, i7-2620M at 2.5, 2.6, 2.7 GHz respectively. Depending on the GPU, they could also go with some of the i7 quad cores (eventually). Again, those likely are at 45W (unless they go with the i7-2920XM 2.5GHz at 55W, very unlikely). The 45W quad core chips would be i7-2630QM or i7-2635QM at 2GHz (the i7-2635QM has slightly faster graphics turbo, 1.2 vs 1.2GHz) the i7-2720QM at 2.2 GHz and the i7-2820QM at 2.3 GHz.
These quad-core chips will rock and possibly will go with the 17". If they put the i7-2720QM in, it would make sense, as it's rather cheap comparing to current CPU prices and also it would blow the iMac i7 and also most of the MacPro CPUs out of the water. The 2820QM and 2920XM would be nice, but are definitely ever more overkill and are much more expensive.
The current 15" MBP highest spec chip has a 1k unit price ~$350 the i7-2720QM is $378. The 1k unit price of 2630/35 isn't yet shown in ark.intel so can't really compare those.