X-Plane 10.11 is now final, so you will receive an update notification even if you have not participated in the beta program.
Starting with 10.11, I am stripping the 'r' designation off the end of the build; the complete build number is still visible in the log file and properties, but what you see on your startup screen will just read 10.11.
I do not know if we will cut an X-Plane 10.12 before we get into a 10.20 public beta of 64-bit; I have seen a number of bug reports for 10.10/10.11 that need investigation, but I don't know if the problems are due to bugs, running out of memory, rendering settings cranked too high, etc.
The main goal of 10.20 is to get us to 64 bit; we'll also ship better anti-aliasing and autogen in that build. We aren't sure what will come in 10.30, but at this point more performance tuning and stabilization is likely.
A while ago, I wrote up a summary of the issues with OSM and water. I still do not know a time-frame or plan for OSM recutting, but I can say it will be after getting 64-bit done, and once 64-bit is done, it will be high priority. If the water you care about is not in the OSM map itself, a recut won't help until you or someone else in the OSM community updates the map.
(For Americans who are frustrated about water that was in X-Plane 9 but is not in X-Plane 10: X-Plane 9 used US Government data. There is work in the US mapping community to get the NHD data into OSM; I suggest participating in this effort. You can import and check a single water shed and thus bring a local region up to date, and the changes are 'forever' since they are in the OSM data set themselves.)