Hi Alysa,
The three options or flavors of EndNote online as you described are still there. The Web of Science version of EndNote online has a max of 50,000 references and 2 GB file attachment storage.
The X7.2 update does remove the previous 5 GB limit for file attachments in EndNote online. It is now unlimited file attachment storage (and no limit to the number of references you can store) in EndNote online for EndNote X7 users. EndNote online for EndNote desktop users is still set on a 2 year cycle, so nothing has changed in that regard.
Hope this helps!