Difficult to say. If we assume that everyone is fit and capable to reach his peak form from the last 2 years, then I'd say:
Ribery Lewandowski Müller
Thiago Schweinsteiger
Martinez
Alaba Dante Boateng Lahm
Neuer
or
Ribery Müller Robben
Götze
Schweinsteiger Martinez
Alaba Dante Boateng Lahm
Neuer
would be our best line-up. However, there's a good chance that Ribery (sadly) won't get back to his best, Götze makes a step forward, then there are huge questionmarks about Thiago's and Schweinsteiger's fitness and Pep most likely will start Robben. In short, I have no clue, way too many quality options to nail down a fixed starting eleven.
I still expect that we'll play a 343 / 334 as our standard formation in the next two years, so something like:
Götze Müller Robben
Alaba Thiago Schweinsteiger Lahm
Dante Martinez Boateng
Neuer
or (yes, the following is no joke

)
Götze Müller Robben
Ribery Thiago Schweinsteiger Lahm
Alaba Martinez Boateng
Neuer
could be a very likely first eleven at the end of the season, depending on who's 100% fit, Ribery and Lewandowski have pretty much the same chance to start as Götze, Müller and Robben. There's also the interesting question about Alaba maybe becoming a regular starter in midfield with Bernat playing leftback/left wingback. What I can't see happening is Lahm regular starting in midfield with the squad we have. Rafinha is clearly our weakest fullback and being forced to start him with no other rightback/right wingback in the squad while excellent leftbacks or midfielders are on the bench would be insane. Unless we buy a new rightback, Lahm will play there again.