I just went through and bumped all the PoodLL mods on the plugins database to indicate support for Moodle 2.9. This allows them to be installed on Moodle 2.9 via the plugins installer.
Only the PoodLL filter had to be altered, therefor the versions for the rest are unchanged. And you don't actually need to upgrade.
The major problem was, and is, that the whiteboard literallycanvas conflicts with requirejs which is a new thing in Moodle 2.9. And I don't have a fix for that yet. So I have had to disable literally canvas. If you can't live without it, don't upgrade to Moodle 2.9.
FWIW other of my mods Video Easy and Generico also have problems, for the same reason. JQuery plugins like the JQuery UI are not loading properly. So Generico tabs and accordians etc are probably not going to work on Moodle 2.9
As soon as I get a fix, I will.