Yes, there will be. Although not much can be added into the RAM Disk product, there should be some new features. For example having image-based disks that are periodically saved to the associated file, and automatically created folders on boot-time disks. These features are currently in the works.
Basically implementing encryption is possible, but what is the point? You could use TrueCrypt to store images encrypted. Encrypting the RAM disk itself makes little sense either. Let's suppose the memory allocated for the RAM disk is encrypted and so are files on it. At the same time, all the files exposed via a drive letter assigned to the mounted disk.
As to plug-ins, well it probably depends on what sort of plug-ins you would like to have. In other words, what would be the purpose of having plug-ins?