Oh definitely! I'm just hoping Haswell & Broadwell aren't too drastically different (besides their speeds and power efficiency), that way I can buy the current 15" with no regrets. That, and I'm hoping to be able to edit photos with no hiccups-... alright I'll admit it, I'm also hoping to be able to play some current games on at least high settings, on a stable 30fps! ;P
I've been burnt by Apple with the iPad 1 before. 6 weeks after I bought the iPad 1, iPad 2 comes out with them new-fandangled cameras and all! >_<
Broadwell will be a big leap in power consumption and iGPU, it's unknown which dGPU apple will use in next year's rMBPs, but I'd imagine it would be a lot better than the year old chip they have at the moment.