Vivo V11 Pro is very much eligible for the software update. The phone comes with Android 8.1 out-of-the-box. However, Vivo has not yet announced the further upgrade of the software.
No. Vivo V11 Pro does not have the EIS support.
Yes, Vivo V11 Pro does have virtual gyroscope sensor.
Yes, Vivo V11 Pro does have the 3.5 mm headphone jack.
The Vivo V11 Pro is a solid all-rounder at Rs. 25,990 and offers better value than the Oppo F9 Pro (Review), but for a bit more money. Think of it as a Vivo X21 with a bigger battery and better front camera, but at a much more reasonable price, which is a good recipe.