캐나다 유저가 소니스타일에 A900 제품 등록을 하려는 기종 선택창에 A500과 A550이 있다고 합니다.

DSLRA350KCF 
DSLRA380L 
DSLRA380S 
DSLRA500 
DSLRA500S 
DSLRA550 
DSLRA550S 
DSLRA700 
DSLRA700P 
DSLRA900

추가 : 일본에서의 A500 스펙(루머)

 Specs (At Photogenius):
　17.20 megapixel CCD / CMOS sensor [that we did not understand a bit - different sensors for focus / measurement of the shooting and immediately?] 
   2.7-inch screen resolution of 920,000 pixels
　8 and 9, the main focus points of support
　viewfinder 0,98 x
　extract, 1 / 8000 - 30 seconds
　ISO 100-12800
　maximum "rate of 4 frames per second
　Weight 516 grams

　So where is no video ...
　1920h1080 32 fps
　maximum time of 1 movie 59 minutes 59 seconds
　Autofocus
　AVI (Motion-JPEG) or MOV (H.264)

출처 : http://photorumors.com/2009/05/24/sony-a500-and-a550-coming-soon/