I notice that in my store account there are three items I don't recall seeing before and dated today:
v 1.0.1 installer - ProChannel - PC4K Expander / Gate
v 1.0.1 installer - ProChannel Concrete Limiter
v 1.0.1 installer - ProChannel - PC4K Compressor
I bought these modules last May, and they're still listed in my available downloads.  Are the above new releases/updates I need to install?

Shows up in my account too. I believe they remain there even after you have downloaded them. Lots of other stuff still in there too.

They are not new downloads. The first few items in your store account will have today's date. Check it tomorrow. It is a bug in the store software.

But my May 2012 ones are listed below without the "1.0.1", so I was thinking the new, second set must be .1 updates?

Mine too. You can d/l and install them if you feel the need. Alternately you can look at the dlls that you already have installed. They are located in subdirectories under "C:\Program Files\Cakewalk\Shared Utilities\Internal" The versions I have are:
PC4K Expander / Gate 1.0.1.28
Concrete Limiter 1.0.1.64
PC4K Compressor 1.0.1.37

I don't understand what the deal is with the dates in the store account. 

Seems as though all "free" stuff gets the current date when something new is added.

Must be some reason. Prolly just stupid programmer cleverness.

Appears to be a glitch. The 1st 5 items have today's date here but have been there since last year.

Steve