Probably. But then again a little there from the slightly higher clocks and little from the "new" Hanswell and we could end up a hefty 10% maybe? My only concern is that even if performance would be on the same level we will have to pay extra - because its NEW on a market.
With regards to NVIDIA
"The rumor says GTX 780M and GTX 770M are almost identical to their predecessors, with no changes to the CUDA cores count. The question is, are we talking about the GTX 680MX (with full GK104 GPU) or the GTX 680M (GK104 with 1344 cores). Also the difference would be in clocks, where the GTX 780M would be clocked at 900 MHz (GTX 680M has 720 MHz clock). What the new listing also confirms is that the card would feature 4GB of GDDR5 memory, just like its predecessor. The GeForce GTX 770M would probably follow the same path. This card also has the same memory size as the current GTX 670M — 3GB"
When comes to AMD there is info about MSI lunching new GX70 laptop with AMD 8970:
The HD 8970M is the successor to the 7970M however specifications wise it isn’t much different at all. The Radeon HD 8970M is based on the same Pitcairn architecture used on the 7970M featuring 1280 (1D) stream processors, 80 texture mapping units and 2GB memory that runs across an 256-bit GDDR5 memory interface. "
So from the marketing graph

6.7% faster then 680 and 10% faster then 7970 if that actually what's going to happend
Both companies are doing same thing ,possibly delaying the new cards for the next year ...
Another thing - maybe some one could share their thought - would outlet have the new revisions of m17x m18x straight away or some time will have to pass untill they will even try to list them ? Didn't look in there before R4 arrived so not sure how quick the listings popped out