yes, according to post by Chrissay, here
When will Stygian Abyss be available to purchase?
Stygian Abyss will be available on September 8th. If you purchase the expansion between September 8th and the 29th you will receive bonus items with your purchase. The items are:
•Exclusive Gargoyle craftable pet
•Decorative Stygian Abyss mob Statues
•Multiple Gargoyle conversion tokens
Where can I purchase the Stygian Abyss Expansion? Can I purchase more than 1? And how much will it cost?
Players will be able to purchase the Expansion through the EA store. This method is recommended for individuals who wish to purchase more than 1 copy of the expansion for their accounts. The expansion will also be available through the UO Gamecode store.
The cost of the expansion for existing players will be $29.99. For new players it will be $39.99 and will include 1 month of game time and all of the previous expansions UO has released over the years.
Where can I find the system requirements for Ultima Online?
The system requierements for all of our clients can be found
HERE