New York-New York has just released 4 new silver strikes, even though Nevada Gaming only has approvals for 3 on its last Gaming List for April. There may be even more that I didn't discover.
If you are only looking for the new ones, you can save time and money by following this advice. They have 4 machines, and are referred to as:
"Babe Ruth" machine
"Rita Rudner" machine
"Patriotic" machine
"House" machine
The "House" machine has 3 new ones. They are Manhattan Express, Miss Liberty and 8th anniversary of Casino. All have 8th anniversary 1997-2005 on back. There are also old ones that are mixed in.
The 4th strike is Rita Rudner 4th anniversary found in the Rita Rudner machine. It is also mixed in.

I won a few new ones and some old ones as well. Front and back of all new ones are shown below.

http://chipcollection4u.com/