I got lazy on my original post and didn't include this info. It should help clarify what I was talking about for the folks without the blue widow card yet.
Giant Spider Web: The unit is caught in a web. Until freed, it may not move or battle. All flags rolled against it count as hits. To free the unit, issue an order to it, and pay 1 Lore.
Blue Widow Web: Place a Web token on the unit the Spider is attacking. A webbed unit may not move, battle, or retreat. Flags cannot be ignored when the unit is caught in a web. To remove a Web token, order the webbed unit and pay 1 Lore.
Fundamental difference here is that the green spider web translated flags directly into one hit each, while the blue spider web falls back on the normal retreat rules to do the damage. This makes the blue web much nastier against any enemy who must retreat multiple hexes per flag.
Giant Spider Poison: If the unit is also hit, it becomes poisoned. All future lore rolled score a hit, killing 1 figure each.
Blue Widow Poison: Place a Poison token and a Web token on the unit being attacked. The unit is caught in a web and is also poisoned. A poisoned unit suffers a hit for each lore rolled against and by the unit. To remove a Poison token, order the unit (must not have a Web token) and pay 2 Lore.
The first part on the blue spider is nothing more than a reflection of the new creature rules and how they already affected the green spider. The second part is a little fuzy to me as far as it being a change. Maybe it was always intended that lore rolled both against and by the unit was supposed to cause hits. It's just not especially clear the way it is stated on the green spider. The last part about being able to remove the poison token is a clear addition. This brings it in line with the wood wyvern's poison attack making poison tokens from the wyvern and blue spider functionally the same. IMO this makes the poison a little weak since you have to attack the poisoned unit the same turn as poisoning it to take advantage of its weakened state.
Until I hear otherwise, I am just going to treat the green spider as if it has the same descriptions of web and poison on its card as the blue spider.