I've said it before and I'll say it again. Only Tesla knows for sure what superchargers are being worked on. They don't announce anything. You are the one claiming, without any factual basis, that they aren't building any. When someone first said this a month or so ago, we found at least three in the next couple of weeks that were being worked on that no-one here knew about.
How exactly are you supposing that we will do our research? On the other hand, what is your research? Please provide a list of all the superchargers that you know for a fact have not been started.
Here's a piece of REAL data for you. There hasn't been an opening in the U.S in 22 days now - the LONGEST time without an opening in over 2 years. Hmmmm.
And did you say three in the U.S. that were found that were not known about? How is that possible when only 2 TOTAL have been started in 2015? The only one that was "found" recently (one of those 2 starts in 2016) in the U.S. was Champaign, IL. And when it was found a couple of days ago, construction was nearly complete - evidence that it probably started in late December. Most likely, only one supercharger has started construction in the U.S in 2016 (Slidell, LA).
I hate to tell you, but if you REALLY kept up with the supercharger build out like some of us do (I check the status of EVERY supercharger EVERY day), you would know that 95% of all superchargers in the U.S are found the day they pull the construction equipment onto the location. The reason that happens is because there are people searching diligently for permits - when permits are found, Blueshift adds the location to his site, and a thread is started for that site (if it hadn't already been). Once the permit is even applied for, people know the location. If you go read the supercharger threads (hint, you can access the TMC threads for each supercharger right through the supercharge.info map) for the sites that are under permit, you will see people reading their county's meeting minutes and permit approvals to to see if Tesla's was approved. And once it is approved, people will constantly "ride by" the site for evidence of any construction equipment, and in particular, crates with "Tesla" written on them (or just the emblem).
There are people ALL OVER these supercharger permits, construction, and openings. VERY rarely do you suddenly see one that no one knew about - maybe 5% tops. And besides, even if you just look at the average starts per month over last 2 years (about 8 per month) and then look at 2016 (one per month in both Jan and Feb), that alone will tell you that the build out has almost stopped in the U.S. Yes, in other countries, people are not as diligent about hunting them and most are found just before or after they go live. But, that simply is NOT the case in the U.S.
And another thing about the "Open" superchargers chart that someone posted earlier - openings will,of course, lag the construction starts. The construction starts are the real indicator because without construction, there will be no openings (I know, you think that most superchargers go COMPLETELY unnoticed - NOT). If the same chart available for construction starts, you would see a long flat line for 2016. But, just wait til April and that "Open" chart will have flattened out too