Presently, SJ runs all X2000, all Inter-City and some of the secondary lines, I would guess the more profitable ones. Veolia has concession on select secondary lines as Sundsvall-Ostersund-Trondheim, Norway and Malmo/Gothenburg-Stockholm-Kiruna-Narvik, Norway; as well as a couple of tertiary lines Linkoping-Kalmar and Linkoping-Vastervik.

Veolia did, however, recently get a concession on the profitable Malmo-Stockholm line, but on condition they start at Malmo Svagertorp (only stop between Malmo C and CPH) and don't serve Malmo C. Besides some smaller towns, they do stop in Lund, Linkoping and Norrkoping. So far only week-end traffic Thursday-Sunday. Free Wi-Fi (with SJ only in First class), and fixed-price tickets are expected to be competitive arguments to get former SJ travellers on board.

The Swedish Government has announced a break-up of the SJ monopoly, starting July 1 with allowing other companies to run trains on week-ends only. A gradually increased presence of other companies is announced untill October 1, 2010, when the monopoly is gone, missed by few.

To your question: No, Veolia has not mentioned anything on ID requests. As they sell only fixed-price tickets, there would be less interest for second-hand sales.