Maybe - depends on when 6 comes out: usually Adobe operate a 30 day grace period, so if you buy 5 today and 6 doesn't come out until July, probably not, based on what's gone before...
Since the Lightroom 6 version has already been announced,
No, it has not. Rumours are not announcements.
Thanks Keith. My bad, for some reason, I thought the announcement was that it was coming out March 9. I was just reading the Canon Rumors site here, but hadn't verified it.
Ah well, that's why it's called "Canon Rumors" And not "Canon Surefire Facts"...
Yes, totally my mistake!!