I'm going to write this answer as I watch, commenting on everything noteworthy I see. I'm am hoping that there will be something in the weapons that
are supposed to be on display. Reports have said that 84 percent of the firepower on display will be shown for the first time. I don't know if that means that any well hidden secrets will be unveiled, but what I am expecting is a lot of stuff we have long been aware of.
I'll say this now, I am not an expert on Chinese weaponry, but I understand the field well enough that I know what and how to google it.
At 5:13 the parade proper seemed to begin with a procession of helicopters carrying flags. The red squares appear to be some variant of the Changhe Z-18. The PLA is supposed to have created their own version which this one might be.
The yellow squares outline attack helicopters that could be the CAIC Z-10.
There were some planes with fanciful colored smoke, but I have no idea what they were. They looked WWII era, so irrelevant for this answer.
Skip to 11:03
At 16:34 there is a unit marching with a weapon that I believe is a variant of the Russian AK-47 called the Type 81. That's nothing knew and has been in service in the early 80's. They have bayonets fixed though... so they must be important.
At around 18:22, when the foreign soldiers start marching, something weird starts happening. For reasons I can't explain, they seem to have something to hide.
That image isn't clear enough to communicate my meaning. For some reason, all the soldiers from a country whose flag I didn't recognize are blurred in the video. This may have something to do with China, the nation itself, or a decision from Moscow, being that this is a Russia Times video.
There is little say about the foreign powers that can't be summed up better in my post to the The Defense Quorum, China's Peacetime War. Some things worth noting. Hungry looked lost and for some reason, the Russians all looked like babies. I'm serious, 25:49 has troops marching that look like they may still be in high school. I don't know if that is some sort of cadet corps or what, but they don't even look they are shaving yet. What's up with Putin's boy army?
China’s Got a New Mountain Tank — War Is Boring
Also making its first official appearance was the ATF-10 fiber-optic-guided, non-line-of-sight (NLOS) anti-tank missile. Eight are carried by a modified ZBD-04A APC. The PLA's interest in NLOS anti-tank missiles became apparent in 2011, and the ATF-10 featured prominently in the 2014 'Peace Mission' exercises. The missile reportedly has a range of about 10 km.
Sorry, I accidentally hit publish when I meant to hit "save draft". So this answer isn't ready yet. I'll finish the rest later.
Edit 2: Ugh. I have been listening to Chinese marches for way too long and and burnt on it. Taking another break. In the meantime, here is a good website with notes on the Parade in more detail. China showcases new weapon systems at 3 September parade and Chinese Military Aviation