Well, my one condition for buying "Spider-Verse" was that May-Day make it through in one piece. Now, the story is over, and this
preview (potential spoilers for May-Day fans at the link) of the epilogue issue shows that conditions were met. Pre-ordered.
All this...
Collecting: AMAZING SPIDER-MAN (2014) #7-15, SUPERIOR SPIDER-MAN #32-33, SPIDER-VERSE #1-2, SPIDER-VERSE TEAM-UP #1-3, SCARLET SPIDERS #1-3, SPIDER-WOMAN (2014) #1-4, SPIDER-MAN 2099 (2014) #6-8 and material from FREE COMIC BOOK DAY 2014 (GUARDIANS OF THE GALAXY) #1
624 pages!!
So, it seems that I won't be disappointed in May-Day's role in the story. I was afraid she would be seen in a couple of panels and ignored, but I gather that she was rather prominent and important.