When will we know what the heck Brennan wrote on the book page from when she and Hodgins were buried?

I dont' think we will ever know :(

maybe never.. we now that hodings write to Angela but we never gonna know who brennan write to

I've been asking this question, literally since that episode aired. I always thought that they would somehow use it to get Booth & Brennan together. But they've had plenty of opportunities to bring it up, so now I'm not so sure we'll get to find out. :(

I'm sure it was to Booth and Angela.

I'm pretty sure we won't ever know. They like to leave it open for interpretation. Adds a little mystery and speculation here and there. (Hey, it's good fuel for fanfiction!) While they could potentially bring that up again since they're bringing the gravedigger back, I wouldn't hold my breath!