It could be nothing substantial, but a person can dream, right? A nod to the next Battlefield game might have been found in Wake Island.
Granted, it's just text that says "2143." But as BF3Blog reminds us, a similar tease for Battlefield 2142 was found in Battlefield 2: Euro Forces. I know some people who would be extremely pleased for a return to the future with the current tech powering the series.
If you have the "Back to Karkand" content for Battlefield 3, go take a look for yourself.