it is announced, but with no more details.
i loved borderland 1, but it had flaws which needed improvement on:
my expectations for borderworlds:
* almost all of the levels don't look like the same brown barren wasteland
* a wider variety of enemies, rather than the same few enemies repeating
* dueling mode puts both players at equal levels
* stat differences between levels lessened to make multiplayer easier
* an actual plot
what do you hope for or expect?