Oh. 
Does that mean between the 15 track CD and the bonus downloads that we're ultimately getting every song that didn't make U22?
22 + 15 + 2 = 39
There were 48 tracks in the running for U22. At present, that means 9 songs remain that haven't been accounted for on U22 or FTGU, and we know more bonus downloadable tracks are coming.
There were 46 tracks total. There have been three bonus downloads. Unknown Caller was bonus to U22. And now we have No Line and Spanish Eyes.
22 + 1 + 15 + 2 = 40. So currently, there are 6 left over tracks that might not see light of day. U2.com says more downloads are coming, but they don't say whether they'll be more bonus tracks, or if they'll be tracks included on the CD.
It looks like New Year's Day, Boots, and Electrical Storm will be on the CD based on the music player embedded in the news article. So the following tracks are the ones left that could be used.
40
I'll Go Crazy If I Don't Go Crazy Tonight (Remix)
Vertigo
I Will Follow
Sunday Bloody Sunday
Pride (In the Name of Love)
Breathe
Miss Sarajevo
Hold Me, Thrill Me, Kiss Me, Kill Me
Stuck In A Moment You Can't Get Out Of
In A Little While
Mothers Of The Disappeared
Desire
Return Of The Stingray Guitar
Your Blue Room
Party Girl
Angel Of Harlem
Scarlet