NEW R+ ALBUM?
According to Emagic, Rammstein and Logic (the software) are working on their new album. It appears that the new album won't be out this year, but in autumn of 2004.
Rammstein to work with Tatu?

Rumors have been flying regarding the possibility of Rammstein working with Tatu, the official site said that "there is no concrete plans at present for any joint projects with the Russian duo Tatu". Maybe? Maybe not?
NEW SONG?

Rumors that Rammstein have recorded a new song. The song is called Shtil' (Calm) and is a cover from the Russian band Aria. It was only Till Lindemann and Richard Kruspe that contributed to the recording.
The story: (Taken from Herzeleid.com):
"According to Aria's singer, Aria and Rammstein have been friends for a long time. Rammstein have often visited them. When the party for the anniversary Harley-Davidson was announced, they first thought that Aria should do a cover for it. But the "main man" in Harley-Davidson in Russia offered a different suggestion: have someone make cover of an Aria song. So, Rammstein were invited to do so. It was assumed that "The Hero of Asphalt" (a popular Aria song, sort of a biker anthem) would be covered, but Till and Richard preferred Shtil', even though it had already been sung by UDO. It is expected that this song will be on the Moscow Harley-Davidson's 100th anniversary album."
The song is in Russian and can be heard (A sample) by clicking Here
There are rumors that a single will be released this autumn, but there is nothing confirmed.
Manson Remix

Marilyn Manson released her/his single 'mOBSCENE' which contains an exclusive Rammstein Remix of the title song.
TRACK LISTING:
1) Mobscene
2) Tainted Love (re-Tainted Interpretation)
3) Mobscene (sauerkraut Remix - Rammstein)
4) Paranoiac
Rammstein to split up?

It appears that the U.K. metal magazine, Metal Hammer, is reporting that Rammstein are on the verge of breaking up. A close source from Metal Hammer says, "They (Rammstein) feel as though they have taken their music / stage show as far as it can go" and are now "looking to pursue other musical projects."
This is just a rumour, so please don't take it too seriously.