There HAS to be a new faction in Iberia. I agree a Celtiberian faction would be a prime candidate, but I think a good case could be made for the Turdetani as well. Descended from the Tartessos, they had their own language and alphabet unique from the rest of the Iberians. They are also considered to be one of the most "civilized" peoples of Iberia. They were early trading partners of the Greeks and Phoenicians and were later heavily influenced by Carthage. I believe they fit in nicely with the EB timeframe, but I'm not really sure about how much information there really is about them.

I of course am biased since I am from that area, specifically Cádiz and Sevilla.

¡Saludos!