In LTE-Advanced focus is on higher capacity:
Increased peak data rate, DL 3 Gbps, UL 1.5 Gbps
Higher spectral efficiency, from a maximum of 16bps/Hz in R8 to 30 bps/Hz in R10
Increased number of simultaneously active subscribers
Improved performance at cell edges, e.g. for DL 2x2 MIMO at least 2.40 bps/Hz/cell.
The main new functionalities introduced in LTE-Advanced are Carrier Aggregation (CA), enhanced use of multi-antenna techniques and support for Relay Nodes (RN).