I'm working away on building a new site (very slowly due to lack of time) using Drupal 4.4.0 and the Gworks theme, with one or two minor modifications of my own. I would like to be able to upgrade to 4.5 when it comes out along with all the modules that I plan to use.
Looking at the upcoming plans for 4.5.0, my understanding is that the theme system will be completely re-written, and I therefore have two questions:

1) Will Gworks theme continue to work in 4.5 or will it have to be completely rewritten (and if it is rewritten how long is this like to take?)

2) What themes will be supported by Drupal 4.5 "out of the box"?