Shareholders in Zillow and Trulia will hold special meetings Dec. 18 to vote on the companies' planned merger, according to an SEC regulatory filing made public today. The merger is expected to be approved. Zillow's meeting will take place in Seattle, and Trulia's will take place in San Francisco. Zillow announced in July that it had entered into a definitive agreement to acquire Trulia for $3.5 billion. If the merger goes through, Trulia execs could acquire the stock awards that they were set to receive in a considerably shorter time period than they would have otherwise, according to a regulatory filing that will be mailed to Zillow and shareholders and Trulia stockholders in connection with the meeting.