The last thing I need is a thing, let alone a book, let alone a book of science fiction, let alone a collection of short sf stories.
But I just might be tempted by Ann and Jeff VanderMeer's Big Book of Science Fiction (contents at i09, plus inevitable thread of outrage at omissions). A big introduction, some interesting story picks to represent well-known authors, a lot of authors I've vaguely heard of and never read, a few authors I've never heard of, and evidence of real efforts to recover erased histories and to adopt an international outlook (including some original translations).
And Rose Lemberg's An Alphabet of Embers, also just out, looks hot. An anthology of very short unclassifiables, "between poetry and prose," mostly by speculative fiction type writers, including plenty of newer voices. (And I think mine is already probably winging its way to Bristol as my Kickstarter reward).