A day earlier than he would've had to and ahead of Germany's new captain, Martin Jaite officially announced his line-up for the first-round tie today. - And there were absolutely no surprises.
So here's the team we'll get to see at the Parque Roca:
& Horacio Zeballos
And here's the line-up of the German team (no surprises there, either):
Leo Mayer and Guido Pella will be there as well, to train with the team. In any case, these nominations seem to confirm that Pico and Charly Berlocq will probably play the singles while it could very well be David together with Horacio Zeballos for the doubles.
The public training sessions at the Parque Roca will for both teams begin next Friday (source).
So that's when we can expect some photos and probably also videos. Whether David is in Buenos Aires now or still at home I can't say at this point.
Edit: Some quotes from Martin Jaite (source).
Without doubt the tie against Germany will be difficult but I trust the team. We'd like to have a great crowd. The players are very excited about playing at home and they're motivated to give everything. I trust them completely and the dedication to this dream that we all share.
Being the home team is always important. Let's not forget that. I'm sure that the people will support us because the team deserves it and because we all dream of winning the Davis Cup.