I agree. However it was posted as a question to where January came from.
January is based on an approximate day count in line with the most recent day counts for this style of mini.
This isn't particularly accurate either and there's lot's of metrics involved. Based on past releases only it could be anywhere between Q2-Q4 with Q3/Q4 looking mostly likely depending on release of the chipsets used.
You generally look to the most recent releases. There is not the slightest chance of a Q2 mini. That's just not happening. The last 2 releases have been 400+ days.
The next major factor is iMac info. The imac and mac mini updates have been released together lately. The imac only recently began shipping BTO right away. That means apple had/has sufficient demand on this model to be backed up until recently. It's likely that they still have strong sales of the iMac (assuming the sales didn't just magically drop off a cliff). Apple has established by business practice a routine that they will not announce/release the new model desktop until demand on the existing model begins to taper off. They do so because to announce or release a newer model earlier would risk cannibalizing the sales of the existing model (after all, few people would buy a machine today if they knew a better one was coming out in the next 30-60 days).
I would be surprised if the appearance was 'revamped' significantly tbh. i7 Mobiles are ready just i3/i5 expected for Q3 afaik? Depending on what's announced at WWDC for Mac Books could give an indication of the processors that will be in the mini's.
I believe you're looking at mini release dates with the following perspective. The chipset is released by intel, and apple necessarily releases the next generation ASAP. This doesn't take into account Apple's most recent business practices and the relevant indicators that people that watch the Apple desktop market closely have identified as relevant.
To go as soon as Q3, Apple would have to make a massive shift in the way they're updating their desktop platforms. Q4 is early but still arguably in line with existing estimates. January is more in line with past releases by Apple.