Hopefully they'll go back to platonic companions once in a while.
There's nothing wrong with a platonic or even asexual Doctor either. The character's not the actor anyway.
Also, when does a child first understand sexuality, in a way more and other than making silly jokes on the playground?
Technically speaking, the true return of Doctor Who as such is when the first producer and creator (Verity Lambert and Sydney Newman) take the position again. Everyone else just did their own take on someone else's creation. As Newton or an ancient Greek might say, something about standing on the shoulders of greats...?
But I never let my life being defined by a TV show either, nor am I heterosexual. So once the new show is released, it'll be fun to see what's radically different or not and go from there. Every new era tends to be radically different already.