A follower of mine on Google Plus, shared this teaser SEGA posted on their site: http://am-show.sega.jp/jaepo16/countdown/
Keep in mind, JAEPO/AOU is a Japanese Amusement Tradeshow in Tokyo and is the biggest in all of Asia. So with it being AOU related, its certainly not only a teaser for a new Arcade game(likely a card game) it certainly also indicates SEGA could be finally upgrading its Ring series line for the first time in 4 years.
Also, there was an interview with Sega Holdings' CEO Haijime Satomi:
Sega Sammy Holdings is SEGA Holdings,Co,Ltd, because SH is not yet open for public trading, SS is still referred to as the investment group.
This line in the translated interview jumped straight out at me:
"Question: How are you going to rebuild the Sega brand and how long do you think that is going to take?
Satomi: As I said before, the Sega brand first became famous as an arcade machine and then with the home video game consoles. The Sonic character was largely popular with those machines and consoles. Unfortunately, we eventually withdrew from the home video game console business. However, our name and brand is still out there because of the famous characters from people’s childhood. We would like to change, adjust or shift our product, brand and business with the current era to be a leader again in the future."
Translation: We want to get back into the hardware business and are willing to change our business structure to do so.
Now to be fair, this interview likely is a few weeks old. But even so, if it isn't(and if Satomi is actually aware of the Dreamcast 2 proposal) then this is a subtle "Yes" to the idea. If this interview is a few weeks old, then this line reiterates what Satomi stated in Famitsu last summer: "Sega in the 90s was known for its "brand", but after that, we've lost trust and we left with nothing but a 'reputation" we'd like to win back the customer's trust and become a "brand" once again."
SEGA hasn't forgotten us, they knows its REAL,TRUE fans are still out there.