Further improvements should lead to a generally better performance. Furthermore, applications can be updated in the package and now officially installed on memory cards (previously this was only possible with tools like App2SD).
One problem remains the support of older models: the original Android phone, the T-Mobile G1, will not get an official update to version 2.2. For other devices, too, things look bad, at least for HTC: only smartphones released in 2010 will get an update, for older models support is still open. With this, Google is gambling away the opportunity to create a uniform platform, as Apple has done so far.