We call the weekly releases "internal build", mainly because they are not thoroughly tested - they are not automatically and manually tested, they passed only the unit tests. The service packs, however, are fully tested builds, that are with higher quality. The internal builds are mainly provided for the clients that need certain bug fixed as soon as possible, while the service packs are for the wider audience.
Regarding the fix, I will check it in today, so it will appear in the internal build this Friday and the service pack next week.
the Telerik team