The new iPad mini Apple introduced earlier this week has a cellular option like all iPads have had, but the new iPad mini does support 5G but not at mmWave levels, like the iPhone 13 line does and the iPhone 12 line.
mmWave is supported on the latest 11-inch and 12.9-inch iPad Pro models as well as the iPhone 12 and iPhone 13 ranges.
mmWave uses 24GHz and above to achieve gigabit+ speeds at short distances, that need direct line of sight. Other 5G is around 6GHz and below and can achieve high speeds, but no where near the levels that can be achieved on mWave.
The new iPad mini is on sale now, with availability from Friday 24th September.