By the way things you've probably already noticed by the gameplay teaser/trailer from IGN :
- the Pipboy interface remains largely the same, with DR and DT shown within the same space (when the guy opened his pipboy it show Damage Threshold, then, after installing the Minigun mod, Damage Resistance.. I wonder if it's an intermittent thing or if we chose what statistic we'll see);
- an icon showing what skill is used for the weapon you're selecting is present at the left of the Pipboy image;
- on the right, just a little higher than the weapon's value, we can see the STR requirement which is apparently 3 for the Grenade Machinegun (according to Sawyer it was a bug by the way);
- the Damage Threshold is either 5 , 7 or 5.7. I'm not sure if the engine supports damage fraction, so I'm going with the first, hinting that there are indeed different damage types.