Some new info (taken from the Polish mag)

[Katarhyne]

It's quite possible that the particle system in Unreal 2 is already in UT2003, just not used. There are a fair number of things in the UT2k3 engine that aren't used in the game.

[EVIL]

the particle system is already used in ut2003.. you can fire a rocket trough a pack of smoke and the smoke wirls.

[WhilelM]

[Zoost]

Wow, that must have been a few hours translating.

My guess is that a few PC game magazines, who are all member of the same publishing house received from that publishing house some screenshots and standard info. I say this because the PCzone netherlands had the same pictures (different layout) and wrote more or less the same info. So there was no "real" interview, they problably got their info from the publisher.