As a Gold member I hardly every get CPUs, however, that changed for me this week. I was upgraded on the following flights, all at least 24-48 hours prior to departure on a G fare:

Tuesday- ORD-IAH- 7:35AM
Thursday- IAH-LAS- 7:30AM
Saturday- LAS-ORD- 8:30AM

I couldn't believe the first two, the last one wasn't too surprising. FWIW, perhaps the CPUs are improving.

-Ualisthebst