1. Mars SR1 and SR2 will be renamed to Mars.1 and Mars.2.
This is to avoid the misperception that new projects can't be added to those update releases. RC1 - RC4 for these update releases will probably be renamed to something like M1, M2, RC1, RC2, with *M2* being the cutoff date for adding new projects to the train.
These labelling changes have not yet been pushed to the wiki with the Mars schedule [1].