Unfortunately, Lem's most thought provoking book, Summa Technologiae (1964), was never (completely) translated into English.
There is only a partial translation into English: http://web.archive.org/web/20041012053805/http://wwwnlds.physik.tu-berlin.de/~prengel/Lem/contents.htm
Russian translation: http://lib.ru/LEM/summa/summtitl.htm
The magazine has a bunch of articles dealing with what the world may be like 98,000 years hence. What with the local interest in the distant future, and with prediction itself, I thought I'd bring it to your attention.
http://www.newscientist.com/special/deep-future?cmpid=NLC|NSNS|2012-0503-GLOBAL|deepfuture&utm_medium=NLC&utm_source=NSNS&utm_content=deepfuture