Well, my impatience led me to expand my search from XDA to Google. I found a couple sites which helped me figure out what was going on. Apparently, the suggestion bar does not show up in certain areas you type in, such as Google Now, the browser address bar, and others. But, when composing a text message, in the body of an email, a Facebook status update, and others, the suggestion bar pops right up. Apparently, this behavior is intentional (not sure why...I think it would be useful in those fields too).
I was using the Swype keyboard on my old phone before I got my Skyrocket, and was used to how that worked. Also, as stated in my OP, even though I had "next-word suggestions" checked in the keyboard options, that was not working, even in texts, emails, etc. I was about to cave and pay $0.99 for Swype, but thought to download the Google Keyboard from Google Play again. The "next-word suggestions" / prediction does indeed work when you are typing in a field that gives you the suggestion bar. So, if you have noticed that in your CM 10.1.2 ROM that you are not getting the next-word suggestions with the default Android keyboard (AOSP), download Google Keyboard from the Google Play store, and you should be good to go.