The Houston Chronicle has posted a video clip of Keanu Reeves arriving at LAX on Friday night (March 27). You can view it here.
Update: There are photos of Keanu at Heathrow at Club Celeb.
Update X2:There is another clip at LAX on youtube. Thus one is from X17online and is from a different angle. Thanks to @keanulatino for tweeting the link!
Update X3: TPG has posted thefive photos at Heathrow.