Spoiler*********************** In dawngaurd a snow elf was still alive and continues to live, and also says "...there may be more uncovered enclaves out there..." do you think we may see snow elves in dragonborn?

Very doubtful.

Bethesda has never released another playable race as dlc so I highly doubt you could play as one,
But it is Possibble that we see more snow mer,

It's not like bethesda has never surprised us before.