Sign up for alerts through trade journal site or professional organizations; you can also follow them in Twitter, LinkedIn or Facebook. Library databases offer alerts but require you to create accounts first; library databases may offer full text holdings whereas the online journal's site may offer partial full-text to non-subscribers (this is called a paywall to help generate memberships or subscriptions).
To get aggregated news story alerts, sign up for the SmartBrief on Digital Entertainment, Advertising and Marketing Industries; it is created by SmartBrief in collaboration with the Consumer Technology Association. It is free & it will send headlines from a variety of publications to your email.
From the Library: