Exactly, I try not to think about the next thing around the corner. By the time the current product comes out, the next revision is always just around the corner, so if you keep waiting you'll never buy anything.
Your Mac has a base total average power consumption of CPU + GPU as 60W.
All late Macbook Pro 15" (' denotes feet, not inches, by the way) has that number at 75W.
Basically, what that means is your Mac should run cooler and be more energy efficient.
Other than that, the performance tradeoff translates to about the same amount. The CPU in late is up to 10% faster, while GPU is up to 100% faster. But that's only noticeable if you game or do 3D modeling a lot.
Actually, the base early has its own advantage. For people who don't play games, it's more energy efficient, and it should run cooler. Reviews have agreed with that as well.
On a side note, high early is not the same as base late. Base late uses a slower CPU (when Turbo kicks in), has half the VRAM (important if you do a lot of 3D modeling or gaming), and does not support 32GB RAM.