Oleg writes:

What started as a quick re-factoring effort transformed to a major redevelopment, but finally all pieces fit together tightly and I am pleased to announce that initial release of USB Host Shield library ver.2.0 has been posted to github.

Some of the major improvements include the use of only 5 Arduino pins, 3.5x faster low-level transfers,  and the ability to use USB Hub(s).

Make sure you stop by Circuts@Home to check out the full details like the current/future  supported device classes and supported hardware versions .