It is all way above my head, but two things are striking from an outsider’s perspective:
– after some comments, the main text starts by “This introduction is essentially identical to a post of the author on MathOverflow” (namely this).
– it lists a forthcoming paper as: P. Scholze. p-adic Hodge theory for rigid-analytic varieties. 2012. arXiv:1205.3463, to appear in Forum
of Mathematics, Pi. (Possibly the first reference ever to this journal.)
I may be wrong, but perhaps even just 5 years ago this would have refered instead respectively to something like “Letter to X” and “to appear in Ann. Math.“