Yes, you will be able to purchase sensors separately and build a computer/handset only weather station. The available sensors at this time are:
5in1 (temp, humidity, wind speed, wind direction, rainfall- fan aspirated standard)
3in1 (temp, humidity, wind speed)
basic tower sensor (temp, humidity)
rainfall (compact AND big mouth collectors)
water temperature (floating for pool, spa, and pond)
Legacy sensors (some were paired with the old 594 system):
wind speed and direction only sensor
solar shielded temp and humidity sensor
the sensor selection will likely grow in the near future- but as of now, we have a pretty good selection of core weather sensors.
As far as embedding or utilizing the data in other ways, like on a website- we are going to be releasing some info on the bridge software for "hobbyists" that may help you do what you want to do- this will not be broadly done as we do not want too many folks poking around if they do not know what they are poking through
. That will likely be after beta, etc, and after the initial production run to make sure it will be useful and relevant info.