As SemiAccurate reported back on the 21st, Kepler will be arriving in the form of a bottom to top release, not the top down that many enthusiasts were hoping for.  The reason for this is a popular topic of speculation, the most likely suspect being that this is not only a process change, to 28nm; it is also an architecture refresh and pulling off both of those together is a tricky proposition at the best of times.  VR-Zone also provides insight into the code names, with the P suffix indicating a lower powered chip, likely a replacement to the GT 500M while the E suffix denotes an enthusiast mobile chip more in line with what the GTX600M is currently.  More spoilers available in their post.

"GK107 is set to feature in four mobile GeForce SKUs – N13P-LP, N13P-GS, N13P-GT and N13E-GE. If these codenames sound familiar, it is because they have previously appeared in a leaked 28nm mobile GPU line-up. GK107 features a 128-bit memory interface, and supports DDR3 and GDDR5 memory. The first three GK107 based SKUs (with a "P" suffix) will likely succeed the GeForce GT 500M series, and will presumably be branded GeForce GT 600M series. The top GK107 part, N13E-GE, may succeed GTX 560M and be part of the GTX 600M series, as denoted by the "E" suffix (Enthusiast). In addition, GK107 will also be part of mobile Quadro SKUs – N14P-Q1 and N14P-Q3."

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