We're looking to replace our old video cassette icon with something that fits in better with iOS 7/8 style icons, and also conveys the learning/teaching aspect better.
The name of the site is a play on "university", so that's possibly something to explore. Diplomas, academic caps, etc. But I think that's a little stale already. Maybe there still is something fresh there with objects like lab coats, mad scientists or test tubes.
Another angle I'd like explored could be inspired by nerd culture: horn-rimmed glasses, pocket protectors etc.
Feel free to experiment with solid color backgrounds and outlined or solid illustrations on top. Should work as black & white as well. Look at the default set of iOS icons for reference. Subtle gradients, clear shapes, clearly visible from favicon size to App Store hero image.
I'd prefer the artwork in a layered PSD, with all illustrated elements as vectors. Try to use layer styles where appropriate. Start out at a minimum of 4096x4096px, in case anything needs a bit of pixel artwork or light textures.
Play buttons or mouse cursors, I don't think this will work very well. Our old logo was a video cassette, but I think this is a little too retro for the product, unless you can bring tapes to the 21st century and iOS 8 ;)
I'll be around for timely feedback, so feel free to upload rough drafts in the early stage. Thanks!