http://news.delta.com/index.php?s=43&item=1259
More legroom like UA, but also more recline (not like UA) and a physically different (maybe more comfortable) seat (same width, though).
Free for Diamonds/Plats, discounted for Golds/Silvers.
I think perhaps this will be the nail in the coffin for domestic E+ on UA and will result in a revamp of the E+ concept on the combined UA/CO international fleet to match the enhanced DL product.