You all suspected it after the official casting breakdown was revealed here at B-D a few weeks back, Dr. Loomis has already been cast in Rob Zombie’s Halloween remake. Inside you’ll find out exactly who will join Sheri Moon, Daeg Faerch (young Michael Myers) and Heather Bowen in the quasi-remake, which hits theaters everywhere August 31st. The casting is official as it comes directly from Rob Zombie’s mouth, more news as it comes in. After being committed for 17 years, Michael Myers, now a grown man and still very dangerous, is mistakenly released from the mental institution (where he was committed as a 10 year old) and he immediately returns to Haddonfield, where he wants to find his baby sister, Laurie. Anyone who crosses his path is in mortal danger.

According to the official Halloween MySpace page:
The great Malcolm McDowell (A Clockwork Orange) has been cast as Dr. Loomis in Rob Zombie’s HALLOWEEN!

Source: Halloween MySpace