Before upgrading from WordPress 3.6.1 to 3.7, the Updates page said two plugins also in need of updates were both 100% compatible with 3.6.1 and unknown with 3.7. A conservative administrator might wait for WordPress to list 100% compatibility with 3.7 before upgrading to it. I upgraded anyway because really I use both fairly minimally.
After the upgrade I went to upgrade these plugins and both were listed at 100% compatible with 3.7. Seems unlikely both were fixed in under 2 minutes. So, it seems like even though the data was there for 3.7, for some reason it was obfuscated from 3.6.1? Annoying.