Exactly will be two updates
1+1
I don't understand why anyone talks about them any more, the entire G system is in everflux, everything is changing all the time regardless of whether anything actually requires changing / fixing / updating / improving / downgrading / upgrading / adding to ...
Google is a jobsworth Corp now, everyone working there has to be seen to be doing something regardless of whether it is required or not, they're like a government, stuff has to be changed because ... because what would they do if they didn't change anything? Put themselves out of work?
So there's another update, so what? There'll be a few hundred more by the end of this year, get a life, stop fretting about something about which you can do absolutely nothing whatsoever. If your site construction skills are solid, if your SEO skills are solide, if your overall strategy and implementation are solid, if your informatiion and authoritativeness is solid, it is most unlikely that you'll be affected by updates too much.
I tell you what, I'll give you a very accurate forecast, there will be a major update about the 5th May ... How do I know? Because every year for at least 15 years there has been a major update around that date! I first noticed it it on 05/05/05, it may have been around before then however that was a significant one and every year since there has been one around that date ... Except for this year now, possibly:-)