I decided to rewatch Pyramids of Mars today (mostly because I won't have time to watch the Tales of the TARDIS version prior to "Empire of Death") and several things grabbed my attention.
At the beginning of the story, The Doctor muses that "It's about time I stopped running around after the Brigadier." I lamented in my review for "The Legend of Ruby Sunday" that it's a shame Lis Sladen is no longer with us to be part of the Sutekh reunion, but at least Lethbridge-Stewart has a connection between both. UNIT, too, since the Scarman estate burned down by the end of the serial and eventually became the location of UNIT headquarters (a detail I had forgotten until my rewatch).
After rewatching the serial, I went back and revisited the climax for this episode and noticed that possessed Susan Twist refers to mankind as insects, just as he did in Pyramids. Hopefully we'll get more little touches and callbacks like that in "Empire of Death."
As much as I love Harriet's speech about all of the gods being children of Sutekh, it is curious to make that connection considering Sutekh's main goal upon his release in Pyramids is to destroy all intelligent life (out of fear that they would rival him in power, as postulated by The Doctor). With that in mind, why is the god of death the father and mother and other of all of these great and powerful beings that could potentially rival him?
I hope that's something addressed and not just Davies trying to make grand sweeping connections with past Doctor Who, but I fear that might just be the case. Again, I find myself thinking of Fenric and feel like he would be better suited for such a role and not Sutekh, but Big Finish already did that (which is probably why that's not happening here).