hmm...
Can you make sure your u-boot tools are also updated ?
By running the command below.
apt-get install u-boot-tools
Then run u-boot-update-bootmenu

I had a problem in which u-boot-tools weren't updated automatically after installing u-boot from HAM/FAM.

Edit: I didn't notice the new version.
Check if your u-boot is updated as well:
Update: 20.04.2013 10:00 UTC: Version 2013.04-1 is in Extras-Devel, support for bootmenu ext2/3/4 partition