Over the past couple of months I have already found myself writing "10.0" or "9.7^H^H^H10" to make it clear that I meant the next release version, because just "10" seemed too ambiguous.
I thought that was just (and maybe some instances were) humor regarding the general indecisiveness on the issue.
Maybe I'm worried about nothing and the ambiguity mostly came from our not having settled the two-or-three-part-version-number question, but I'm not sure.
I think this dynamic will sort itself out.
I suspect I'll end up using 10.x somewhat frequently though I'm mostly on the lists. I suspect the choice will be dependent on context and channel.
