The German Marshall Fund has a new briefing out looking at Turkish Prime Minister Recep Tayyip Erdogan's recent visit to Washington. Written by Ian Lesser, a very astute observer of Turkish affairs, the briefing suggests that, "Overall, the experience has produced more open questions than answers regarding the future of U.S.-Turkish relations."
From the report's summary:
Both sides are likely to have come away convinced that some potentially difficult issues have been managed. Yet, the visit did little to bridge substantial differences in perception and approach on key issues, above all, Iran, the Palestinian issue, and the complex of disputes in the Caucasus. Policymakers and observers on both sides are left with a list of unresolved open questions that could shape the course of the new model partnership in the near to medium term.
(You can read the full briefing here (pdf)).