Does anyone now if a second batch is going on sale ?
I'm not sure about this, but it seems to me that new tickets could appear any time as season ticket holders releasing their seats. Now there is not any free seats but the sale is not closed.
Sale strategy to El Clasico for example is different because sale period is closed once the normal seats are sold, and then there would be another sale period when all the accumulated freed up seats are sold.
Now, normal seats are sold but sale is not closed and this means to me that a ticket could appear any time.