Bindings: swig-py, swig-pl, swig-rb all pass their tests. ctypes-python fails to build for me. Java: Philip said "I've run javahl tests in single-db, 3 FAILs compared to 1 in multi-db."
Upgrading from a dev version: When the switch is made, after updating and re-compiling, each dev using a trunk WC (format 18) will need to run tools/dev/wc-ng/bump-to-19.py on the WC. Running the new svn on an format-18 WC will report a friendly message advising you to use bump-to-19.py. (Running it on an older 1.7-dev (format <= 17) WC will probably upgrade one directory to format 18 and then exit with that message, which doesn't sound quite right.) Running an old svn on a format-19 (single-db) WC results in a friendly error. I think we're all set to switch it on. - Julian