There are three sources of information that I can find, and there are quite a few differences between the listed specs. I'm not sure what to take from it.
AT&T Webpage:
HTC Aria? Android? Smartphone ? Coming Soon - Wireless from AT&T
* LED flash
* 256 MB RAM
* Weight: 4.6 oz
* Size: 4.6" x 2.3" x 0.47"
* Battery: 1300 mAh
AT&T "Fact Sheet" (PDF):
http://www.att.com/Common/merger/files/pdf/HTC_Aria_fact_sheet.pdf
* No mention of LED flash
* 384 MB RAM
* Weight: 3.8 oz (with battery)
* Size: 4.1" x 2.3" x 0.46"
* Battery: 1200 mAh
HTC Press Release:
HTC Press Release - Read the Latest HTC Mobile Phone News
* "Just over 4 inches long"
* "Weighing a mere 4.05 ounces"