After installing the Lotus Notes / Domino 8.5 Beta 1, I could not find any Lotusscript Class browser in the new Eclipse based Designer.

Then I found this blog entry by Julian Buss

There is no new LotusScript editor. And the new, Eclipse based and class browsing LotusScript editor will NOT make it in 8.5

Julians post links to another post by John Head in the IBM Lotus Notes/Domino 8.5 Public Beta Forum

… this was announced at Admin 2008. It just did not make it in time. It will come in a future release after 8.5 … not sure which they have targeted