Hi Po Boy,
767 is new to Europe and has been used by DHL only in the U.S. so far. But those were/are all -200 Conversions.
ABX in the States still uses quite a lot of 767-200. Many (all?) of them in yellow livery. But I think DHL (or better Deutsche Post) sold ABX last year. (at least the share they were allowed to have) All work for DHL ABX is now doing on the 767 is ACMI. (Like BRU-LOS-BRU on ABX's 767-200)
To my knowledge in the States only ASTAR is still in partial ownership of Deutsche Post/DHL (49%). But no 767 there.
In 2007 six 767-300ER Freighter were ordered by DHL. 3 of them are coming now. What will happen to the next bunch? I don't know. DHL's 767-300ERF Freighter is the first of that type to be registered in Europe.
No further 767 have been bought for conversion. (wouldn't make sense, because with the delay of the 787, market rate/value of 767 is still very high) Should DHL consider 767 for fleet replacement/growth, they definitely gonna wait until the 787 frees 767 in good numbers. But again, no plans have been revealed to buy ANY aircraft. And nobody knows yet what the successor of the 757/A300 in Europe will be. Could well be "younger" 757 that are to be converted. Just remember how long the 727 was flying for DHL. So the 757 might stay in the fleet another 20 odd years. However, when DHL bought those 757 from BA around millenium turn, talks were there already about running a 757/767 mixed fleet in/from Europe very soon. But, since then only the rumours have never stopped. The 767 that finally are coming now will only be used for longhaul. They don't suit in the European Network. Not much mixed fleet flying for the pilots either. Will be initially run as a separate fleet. (you fly 757 OR 767)