While there is no dynamic link between Encore CS6 and After Effects CC, you can use the Encore "Create After Effects Composition" and it will send the psd file to AE CC and create a new composition with appropriate settings. AE no longer has mpeg export, so you export from AE to AME.
I found a simple way to do it. I duplicated the menu, set the animated menu to first play, then I have it switch over to the secondary menu that has the still image on it. The buttons remain the same on both.