I need to pick up a MBP towards the end of this year - preferably before the end of September. I'm going to wait for this year's refreshes and I'm currently looking at the high-end stock build 15" which is a whopping £2200 (£1833 pre 'sales tax' (VAT)) which is something like $3050 (again, excl. sales tax)!
So if I bought one for the last week of Sept when I actually need the thing and then they get refreshed in October, at $3k I would be mighty upset.
You might be waiting until this time next year for the refresh. Still outside of the battery life gains, i honestly can't see anything else compelling in terms of ports, features or design for any possible refresh.
Unless of course they introduce a multi touch display which i doubt.