It appears that The Walking Dead Season 2 is going to fill some of the gaps between the time Rick enters the hospital and the time he wakes up. Sarah Wayne Callies recently spoke with TV Guide and discussed filming a flashback scene for the upcoming season:

"It was fun to step out of the zombie world and show Lori with a BlackBerry... The scene underscores how deeply Lori and Shane love [her son] Carl, plus I hope it will finally put to bed the ridiculous rumors that an affair was going on before [Lori's husband and Shane's friend] Rick 'died.' "

The Walking Dead Season 2 will premiere on AMC October 16th at 9PM. To watch the previously released teaser trailer, visit: http://dailydead.com/the-walking-dead-season-2-trailer/

Source: TV Guide