The assumption is a minimum of 2. However, with the large amount of space at the end of the table, we might have 3 Neutral Corp cards or an increase to the number of faction specific Corp cards.
One possible example:
Data Pack with Corp Identity 2: +1 NBN, 2 Neutral Corp Cards
Data Pack with Corp Identity 3: +1 Weyland, 2 Neutral Corp Cards
Data Pack with Corp Identity 4: +1 HB+Jinteki, 1 Neutral Corp Cards
If they increase the number of Corp cards, they can do the same for Runner cards. I'd rather we keep the list as conclusive as possible.
One possible example:
Data Pack with Corp Identity 2: +1 NBN, 2 Neutral Corp Cards
Data Pack with Corp Identity 3: +1 Weyland, 2 Neutral Corp Cards
Data Pack with Corp Identity 4: +1 HB+Jinteki, 1 Neutral Corp Cards
If they increase the number of Corp cards, they can do the same for Runner cards. I'd rather we keep the list as conclusive as possible.