That sounds like a great idea getting Haswell instead. I'm just concerned for the better battery life on the Broadwell. My MBP 2009 now gets about 4 hours, which I'm not too impressed with.'
I'm also nervous about getting one now because what if the Broadwell has a redesign? Considering this is a very large investment for me (college student) I wouldn't want my brand new computer to go obsolete too quickly!
I get ~7-9 hours on my 13" Haswell depending on usage. I'm currently sitting at 74% and it has an estimated 6 hours 20 min left.
I can't see the better battery life of Broadwell being phenomenal or being worth the wait, given what the specs are at currently with Haswell.
Especially since you're a college student, as I stated above you can get either:
late-2013 13" rMBP 4gb/128gb for $1099 - $100 (best buy .edu discount) - 10% (USPS movers coupon) + tax (in california that comes out to about $977 after taxes)
or the 8gb/256gb version for $1299 - $100 - 10% ($1173 after taxes in cali, we're at about 8.75%).
The mid-2014 13" rMBP 8gb/256gb is retailing for $1499 before taxes. The broadwell will probably be around similar price.
With all that said, if you can wait, then by all means wait because the Broadwell will have better specs than Haswell. But considering how much you can pick up a late-2013 haswell for right now, my recommendation would be to jump on it if you're looking to buy, because I don't think the marginal increase is worth the $$$ difference (~$300).
Just my personal 2 cents.