Beltre hit cleanup most of 2011, but after returning from his hamstring injury, he dropped to the #5 spot, with Michael Young hitting #4 for the rest of the season.
The indications are that the 1-2-3-4 spots are likely to be filled by the same players who filled those roles in the lineup most of last season -- Ian Kinsler, Elvis Andrus, Josh Hamilton, and Adrian Beltre.
In fact, given that the Rangers are basically returning the starting lineup intact (other than Julio Borbon likely replacing Endy Chavez as the guy sharing the centerfield role with Craig Gentry), it would be reasonable to assume that we'll see pretty much the same lineup as the Rangers ran out most of last season.
Also, get used to seeing the photos like the one at right throughout the season. I think they are awesome and plan on recycling them once the season starts.