The HTC ThunderBolt Ice Cream Sandwich update that has been delayed since the end of August, might finally roll out to ThunderBolt owners by the end of October.

We received a tip today from a reader who says that Verizon informed them, through a phone call, that the HTC ThunderBolt Ice Cream Sandwich update is in the final stages of testing and that Verizon currently plans to roll it out by the end of October.

The person is a HTC ThunderBolt owner who sent Verizon an email venting frustration over the Ice Cream Sandwich delay. And much to their surprise, Verizon called them and relayed the above information. It’s unclear at this point whether Verizon has begun telling other inquiring HTC ThunderBolt owners something similar or if this person just so happened to get information they weren’t supposed to.

So at this point, while this seems to be pretty credible, HTC ThunderBolt owners will still want to circle the month of October in pencil but we wouldn’t get excited just yet.

Read: HTC ThunderBolt Ice Cream Sandwich Update: Time for a Decision.

That’s because there is always a possibility that something might go wrong in testing, delaying the software even further than it already has been delayed. We know HTC and Verizon have been working on this update since the delay back in August and it appears that we could be closer than ever to a decision on the update.

As of now, HTC and Verizon remain mum on the whereabouts of the update, only saying that the software is being worked on and that they would provide more information as it becomes available. We assume that this is because the update is still in testing, again possibly in the final stages, and because they haven’t yet determined an official roll out date.

Read: List of Broken Android 4.0 Ice Cream Sandwich Promises Could Grow.

Unfortunately, we haven’t heard anything in regards to the Droid Incredible 2 Ice Cream Sandwich update, an update that was delayed alongside the HTC ThunderBolt ICS update, though we imagine that HTC and Verizon are currently working on that one as well.

At the very least, the silence means that they still haven’t cancelled the update and if today’s rumor proves fruitful, it may actually roll out to ThunderBolt owners at some point this month.

We’ll keep digging and update you on what we find.