This local news from Baden-Baden reports on a meeting with the 16 cities of the serial nomination Great Spas of Europe in Bath. The next meeting will be held in Vichy in May.
According to the current schedule, the final submission of the nomination dossier will be in January 2017, so decision could be in 2018.
I understand that an unresolved "issue" about this nomination is that, whilst everyone agrees that 16 is too many sites to nominate, all 6 German sites want to remain in!!!! To the extent that "non German" sites voluntarily withdraw, the %age of German ones remaining obviously increases still further!!
One possible "strategy" (reminiscent of the Le Corbusier nomination???) is for a nomination with all of them to go forward and leave the "decision" to ICOMOS. It seems unlikely that ICOMOS would actually decide 100% which sites should remain but, at least it could give some "pointers" as to where it sees/doesn't see OUV