Epson has been really bad about posting announcements as to their progress on updating their printer drivers. However, they posted a new OS X support page (about a month ago - how did I miss it?):
It lists a whole bunch of printer drivers coming out with 10.1, hopefully within the next week or two! Unfortunately, it lists the 740 and 760 as coming out, but I didn't see your 750. Maybe it'll be close enough to work - who knows.