It looks like tough sledding for Hollywood this pre-Christmas weekend, according to distribution executives with an eye on tracking study data.None of the three new wide releases appears likely to open impressively."It doesn't look too exciting in terms of the openings," said one studioexecutive. "The first choice on 'Bicentennial Man' is running only like 8%. Now, admittedly, it's (only mid-week) but I would think they would like to have been in double digits by now."Buena Vista/Touchstone and Columbia Pictures' PG-rated sci-fi fantasy "Bicentennial Man," directed by Chris Columbus and starring Robin Williams, opens Friday at about 2,200 theaters.While 2,200 theaters is certainly a wide break, it's not as wide as last weekend's theater count for "Toy Story 2" (3,257), "The Green Mile" (2,875), "The World Is Not Enough" (3,063), "End Of Days" (2,652) or "Sleepy Ho