Swampert and BlueManaphy: Your fanarts are great! You two are really good artists!
Now time for me to contribute some fanwork:
If May makes another cameo (Small or big)in DP, what kind of hints would she bring?
Well it's possible that May could visit to watch the Grand Festival or Sinnoh League. (And we all know that if she comes to the league Advance is pretty much canon! *shot*) If one of these were to happen May and Ash could talk about the old times (Grand Festival) or May could cheer Ash on in the League. (League obviously)
If it were a small cameo, I would agree with DD. I like the idea of May watching the League and for her to pull out her half of the ribbon. And maybe she could put hold it close to her heart for an added plus. ;)