Padilla and retroactivity

The potential impact of Padilla v. Kentucky is ongoing.  Two primary issues.

Is the holding retroactive.  The Supremes have that issue before it.

Does Padilla extend the defense counsel obligations beyond immigration consequences?

We know in the military from United States v. Miller what a defense counsel obligation is when a client pleads guilty to an offense for which sex offender registration may apply.

Here is a piece from SCOTUSBlog about Padilla.