I don't think Peter will be back any time soon. There's simply too many young characters there at the moment; with Dexter arriving there will be yet another male in Peter's age range which kind of means Peter isn't needed
It's shame; the eldest son of the shows only surviving original character (until a few months) should really be front and centre of the show at 18/19. As a character we've watched on-screen since he was born this is a point in his life we really should be seeing a lot of what defines you as a person happens during these years but they've all but forgotten about Peter. Lucy's mentioned him once since she got back even then it was just a quick shrug "We fell out" and there's been nothing since, we've had no word on how he's doing, if he's got a girlfriend, a job, friends, where he's living exct... It's simply ridiculous. From what I can tell he hasn't seen Ian or Bobby since Christmas Eve 2010; I know 17 years olds want their inependance but I really struggle to believe my parents would be happy with me not coming home for two years at that age. They got a bit iffy if I was away for two months without a visit; you simply aren't grown up enough or responsible enough to take good care of yourself at that age. It damages Peter as a character as it seems he doesn't care for his father or little brother and it damages Ian as a character as it seems he isn't bothered one bit about seeing his son
Peter wasn't even informed his dad had a mental breakdown and was walking the streets for god sake. Surely Lucy could've put aside their "falling out" in that case; it's like they've forgotten he exits. Lauren, Whitney, Jay, Tamwar, Fatboy, Abi were all on friendly terms with Peter yet none of them have asked how he is
Reading up on a bit of Corrie history this all seems very similar to what happened to the character of Peter Barlow, Ken's son. Peter Barlow wasn't seen between the ages of 18 and 35 before he eventually returned. Who's to say that won't be the case with Peter Beale? They're certainly in no rush to bring him back that's for sure which is a shame as I'd rather have Peter over the likes of Tyler, Tam, Joey and Fatboy