I placed an order for a glowforge plus on the 3rd.
Have not received any shipping notification.
Several emails I sent have had the “apologetic, we don’t have any info and will get back to you when we do.” response.
I’m still waiting.
Should I be concerned?
No, but you have done the right thing by notifying them of it. (Which opening a post here in Problems and Support does.) 
I placed my order for a glowforge plus on the Jan 2nd.
Have not received any shipping notification.
Several emails I sent haven´t even been replied.
I’m still waiting.
Should I also be concerned?
So about 30 mins after my initial post, I got a Fedex shipping notification.
After digging around, it’s from GF in Fort Worth TX. Weighs 78 Lbs.
Must be it.
You’ll need to start a new post under Problems and Support – this one is on someone else’s support ticket. 
For some reason, Glowforge is also very bad at actually sending shipping notifications, so it’s not unusual to receive your items before you’re told they’ve shipped. You can sign up with both UPS and FedEx for free services that will tell you when a package is on the way, which is probably worth doing anyway.
I see you already received your Glowforge, so I’m going to close this topic.