Board Thread:Spoilers!/@comment-1916997-20170515032618/@comment-24674051-20170517015719

For the mains, we already know that only Regina (Lana), Killian (Colin), and Rumple (Robert) are returning, plus the older Henry and Lucy (technically still new, but since introduced in season 6, it allows them to be returning). Any other new mains (and honestly, I hope it is only 1 or maybe 2) will be announced in a couple of weeks (well, towards the middle of June) when the get ready to start filming season 7.

As for regular supporting characters, we may not see any of the current set return, except possibly Tiger Lily replacing Blue (it did appear that TL is once again a fairy from the flash forward), except as potential 1 episode guest/cameo. I say this since Adam and Eddy have intimated that the next chapter will not be Storybrooke centric. I am guessing that, for some reason or another, Henry was exploring the EF countryside (possibly as part of being the author) when everything we saw in the flashforward went down, so just guessing that supporting characters will likely come from the EF, or possibly other realms. Now, since things will take place, at least some, in the EF, I will leave open the possibility that an older Roland (he's likely 18-20) could be introduced as an "established" character.

Now, given that Lucy is 10 and is Henry's daughter (until proven otherwise), I think it would be safe to assume that Henry is around 28 (I am going with Henry fathering the child when he was 18 to mirror what happened with Emma, though it would appear he did not abandon Lucy). this would make Neal, Robyn, Gideon, Alexandra, and Philip all teenagers, so they could possibly introduce one (or more) of these characters, or even a half-sibling for Henry (assuming a child for Killian and Emma), that could be somewhere between Lucy and Neal in age. But I would still anticipate that any of these would be either just mentioned, or possibly a brief cameo, not a main or supporting character.