There was an earnings call for Dexcom on 8/3/11. These quarterly calls are always the best way to get information on next Dexcom products.
The conference call is at http://investor.shareholder.com/dexcom/eventdetail.cfm?eventid=100559
. Listen starting at 5 minutes, 18 seconds into the call
They said that the Gen 4 has just had their study design and IDE application approved. They said the trial will start "later this summer". They said that the submission of these pivotal trials should happen "by the end of the year", but underscored that there may well be delays. I would SPECULATE that would mean the Gen 4 will be available mid year, BUT ONLY IF ALL GOES ACCORDING TO PLAN.
The (idiots) at Obama's FDA call this a "significant risk device" so this keeps better technology off the market. "On track to complete the trial and complete the submission by the end of the year". There is no benefit to the bureaucrats at the FDA getting better devices to the market, but if they delay and raise the cost to everyone, the FDAs believes if they delay everything they are doing a stellar job. Now Europe and Asia is getting new products before the US. (But that just my frustration since I'd really like the Gen 4 sooner).
They also said they will be going into trial for the Omnipod integration in H1 2012.