This is what Doorbot team replied.
"Thank you for following up. I'm very sorry for any inconvenience, but Lockitron was experiencing heavy backorders due to some performance issues and ensuring that their product, which ultimately provides security to one’s home, was performing well. That being said, we have been made aware that Lockitron is in the process of honoring its earliest shipments, and that our orders will be attended to shortly. We are realizing that this extra delay provides us with a value-add in that we are able to monitor their performance with regard to earlier customers, so as to best ensure that our customers receive the best product possible. Further, once we receive a shipping schedule from Lockitron, we will be able to create our own shipping schedule on our end and thus, provide you with a better timeline.
Doorbot Support Team"