Russia seems reluctant to use it's more modern ground equipment and heavy tanks. So far I have only seen a few videos of T72s, no T80s, T90s - let alone Armatas.
Most IFVs look like older BMP-1s and from what I've seen most APCs are older BTR variants.
Seems like at the moment not much heavy Artillery is being used, with most of the shelling coming from TOS-1 and Grad systems.
If the Blitzkrieg tactics fail to force a rapid surrender, we may see more modern equipment and heavy artillery enter the war, which would be scary for any civilians and ukranian resistance in urban areas.
If Russia continues to commit to blitzkrieg, I can see the following happen, based on movements so far:
1. Sumy will be easily surrounded as russians are pushing south on both sides.
2. Chernihiv will be surrounded by soldiers pushing south from Belarus and troops cutting through from north of Sumy in the east.
3. Mariupol will be surrounded by separatists in the east and north, the troops who invaded via Crimea will cut off the supply lines from the west.
4. Resistance in Kharkiv is strong so far, which is scary, as carpet bombing/heavy artillery may be the only way to force retreat and capture the city.
5. Once Chernihiv is cut off, Russians will push south and attack Kyiv from both sides of the Dnieper river - defenders will be fighting on two fronts.
I sincerely hope none of this happens and we somehow see a peaceful outcome sooner than later.