If You had not gotten a grace period update before - yes.
As I wrote above: Buy 10.5 update and activate it after 11.0 or whatever it will be called is out, and you will get a 11.0 license update for free.
Again given the fact, Steinberg do not change their grace period policy.
Otherwise - if you like to tale the risk, the grace period time is 4-6 weeks. (Ithink 6 weeks for Cubase)