Let’s assume the 1% change for Orb of Power is taken from Orb of Growth, and nothing else in the chance table has been changed.
To put this into perspective, we can ignore the first 2 orbs.
Based on the assumption, Orb of Clans => Mythic chance hasn’t changed.
If we look at Orb of Power as essentially equal to 3 Orbs of Ascension (for future Soulforge purposes), then this is effectively a 20% buff to Major Orbs of Chaos, i.e. every Major Orb roll is now worth a statistical average of 0.18x Orb of Ascention instead of 0.15x.
Not counting smaller orbs of chaos, according to current schedule, weekly/weekend events** give about 150 Major Orbs of Chaos a year ~ 9 Orbs of Power, which would have been 7.5 before the 1% chance.
** Not counting Vault events that give a chance at Major Orbs from Vault Keys.