The LibreOffice project hoped they would, but Oracle didn't like the idea... Probably the biggest thing is that IBM wanted it with a more permissive licence so

The LibreOffice project hoped they would, but Oracle didn't like the idea... Probably the biggest thing is that IBM wanted it with a more permissive licence so they could keep selling their commercial product without giving away any of their source, but the LibreOffice project wanted to keep the suite as free software (which is why all the new code that LibreOffice writes is LGPL). As it is, OpenOffice at Apache will probably bitrot - pretty much all Linux distros have switched to LibreOffice (so that's where all the developers who aren't employed by IBM or Oracle have gone), and LibreOffice can use Apache code in their product, but Apache OpenOffice can't use LibreOffice's code - so they won't benefit from the massive cleanup that the LibreOffice project has done to the codebase over the last year, or the new features they have brought in.