Google do seem to be releasing an awful lot of new functionality recently, it's almost as if they have an Advent Calendar in place this Christmas, with a new function being released every day!
We are certainly living in even more interesting times. I just hope that google are 'thinking it through' what the impact will be of these rapid succession of new releases. For instance a moving real time feed might even distract attention away from their PPC area and their main source of income.
If you think twitter gets a lot of spam now, wait for that spam to increase with google exposure! Wait for the black hat SEOs to set up zombie PCs automatically posting to various real time source feeds used by google.
Thankfully, the realtime feed's inclusion of other sources makes for a more useful feed, e.g. press releases, newly released articles etc. Google for mobile phones.
The problem with trying to target realtime results ethically, is the very nature of them, being live. So even if you do get a mention with some new content you create today, it wont be there in the feed all day, only for a few minutes (I guess for certain popular phrases that could still be a lot of eyes, but also a shorter exposure time with lots of updates). To paraphrase a well known saying, this minute's news is last minute's chip shop paper. So that's where more permanent and more traditional SEO kicks in again.