I don't plan on upgrading to OS X Mavericks (10.9) soon. Maybe my old MacBook supports it, and I could use an external boot drive or separate partition for testing. All packaging will still be done on Lion.
I've had a few reports that my Lion builds work on Mavericks. At least QGIS, GRASS and the frameworks and Python modules. MapServer/PHP is old and probably will not work. Postgres/PostGIS should be OK.
I've heard that upgrading to Mavericks clears out the Python site-packages, so reinstalling the frameworks and Python modules is probably necessary.
I'll add more info to my download pages when I have more definite info.
I'll still support Snow Leopard for a while, even though I suspect Apple will be dropping Snow Leopard support now that Mavericks is out. This will last until the Macs where I work are upgraded to Lion.
I forgot to update the installer ID for Postgres. So if you are upgrading from Postgres 9.2, it will remove 9.2 files, leaving only data and extension files, and the upgrade process will fail. If you tried upgrading Postgres 9.2 to 9.3 before today, first reinstall Postgres 9.2. Then download and install the Postgres 9.3 package from today. Your data in 9.2 should still be intact and the upgrade process should now work.
Postgres 9.3 is ready. Along with PostGIS 2.1 and pgRouting 2 rebuilt for Postgres 9.3.
Remember to read the upgrade readme before installing. There is a small problem with PostGIS that affects the upgrade, but it can be easily fixed before upgrading (see upgrade readme).
I added the Shapely Python library to the GEOS Framework. For the system Python only.
Now that the big QGIS 2 release is done, I have time to look at other things. pgRouting 2 for Postgres 9.2 is ready.
I'll be working on Postgres 9.3 next. There's a big internal change for handling shared memory, hopefully it will test out OK. Again, patience please.