We really kind of need Forge to update before we can do anything.
Also be aware that there are major internal changes with 1.13. IIRC the Forge people were estimating at least two months before the first stable release. There will probably be development snapshots before that but it should give you an impression of the amount of changes possibly required for updating. Not to mention that we'll also try to keep compatibility with all 10 previous versions. That'll be fun.